Sandal upper



FIG. 1 is a perspective view of a sandal upper showing my new design;

FIG. 2 is a right side elevational view of the sandal upper;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front elevational view thereof; and

FIG. 6 is a rear elevational view thereof.

The broken line showing of a sole is for illustrative purposes only andforms no part of the claimed design.

The ornamental design for a sandal upper, as shown and described.